Measuring instrument.



B. F. SASSAMAN.

NIEASUHING INSTRUMENT.

APPLlcATloN mso MAlLso. 1911.

Patented Apr. 13, i915.

4 SHEETS-SHEET 1.

WFTNESSES ATTORNEY INVENTOR 'nn IMURRIS PETERS C0 PHOTO-LITHO.. WASHINGTON. D. C

B. F. SASSAIVIAN.

MEASURING INSTRUMENT.

APPLICATION FILED MAR. ao, |911.

Patented Apr. 13, 1915.

4 SHEETS-SHEBT 2.

WlTN ESSES ATTORN EY THF NDRRIS PETERS CO.. PHOTU-LITHO.. WASHINGTDN. D. d.

B. F. SASSAMAN.

WIEASURING INSTRUMENT.

APPLlcATloN FILED MAR. so. 1911.

Patented Apr. 113, 1915.

i SHEETS-SHEET 8.

WITNESSIES ATTORN EY THE NORIS PETERS CO.. PHOTO-LITHO.. WASHINGTON, D. C.

B. F. SASSAIVIAN.

MEASURING INSTRUMENT.

APPucATIoN FILED MAR. 30. 191|.

l Patented Apr. 13, 1915 4 SHEETS-SHEBT 4.

l l l I mlmLnlmmInfn fabienne/13 o THE NORRIS PETERS CO.. PHOTO-LITHO.. WASHINGTON. D. C,

rain aan MEASURING INSTRULIENT.

Mateos.

Specification of Letters Patent.

Patented Apr. 13, 1915.

Application filedv March 30, 1911. Serial No. 617,848.

T0 all fte/10712, it may conce/m.'

Be it known that I, BENJAMIN F. SASSA- MAN, a citizen of the United States, r'esiding at lest Chester, in the county of Chester and State of Pennsylvania, have invented a certain new and useful Improvement in Measuring Instruments, of which the following is a specification.

My invention relates to a new and useful improvement in `measuring instruments, and has for its object to provide an exceedingly simple and effective device of this character which may be used for a variety of purposes such as a square, a lsquare, a level, calipers, arid can also be used in determining unknown measurements in geometrical figures when certain measurements are known.'

`W ith these ends in view, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims. A

ln order that those skilled in the art to which this invention appertains may under'- stand how to make and use the same, I will describe its construction in detail, referring by letter to the accompanying drawing forming a part of this specification, in which- Figure 1 is a plan view of my improvement showing a portion of one of the blades broken away. Fig. 2, a section at the line m2-w2 of Fig. 1. Fig. 3, an inverted plan view of the collar and its blade. Fig. 4l, a similar view showing the head mounted thereon. Fig. 5, a similar view showing the head set at an angle other than a right angle. Fig. 6, a plan view showing the blade and its mountings connected to the head, said head having a projecting blade and used for marking stair horses, finding the hypotenuse 0f triangles and the like, and Fig. 7, shows the device in use in marking stair horses. Fig. 8 representing an enlarged reverse or bottom plan view of the head C, showing the blade A rigidly attached thereto. Fig. 9, is a similar view of the circular plate removed from the head.

Fig. 10, is a section at the line 1010 of Fig. 9; and Fig. l1, is a section at the line 11-11 of Fig. 10.

In carrying out my invention as here embodied, A represents a blade provided with graduations B, each inch of which is preferably divided into twelve sub-divisions.

The blade A is provided with a head C connected rigidly therewith and having an angular projection formed integral therewith provided with an opening E, in which `is mounted a spirit level F, said level being parallel with the blade A so that when said blade is laid upon a surface the user may tell whether said surface is level or not.

WTithin the head C is revolubly mounted the circular plate Cr, provided with an aperture H, which is preferably rectangular in shape. rllhe circular plate G has a flange l which rests in an annular groove J formed in the head C. rlhe circular plate G is provided with a screw K which has a bevel end L adapted to engage the opening M, having a beveled wall N formed in the tightening` member C, which is provided with a beveled edge l), said tightening member being dovetailed in the under side of the bridge a, the edges of which are beveled, as at b, said bridge being formed integral with the circular plate G. rlhe circular plate G is provided with another screw Q having a head R which extends beyond the edge of the circular plate into an annular groove S formed in the under side of the head C. On this screw is threaded a circular nut T which will draw the head Rrof the screw Q against the surface of the head C, thereby tightening the head C and the circular plate with relation to one another.

The head blade U is provided with a groove V, the side walls lV of which, are beveled. This head blade slides upon the bridge a and when it is desired to hold it in any one place the screw K is threaded inward, the bevel end L of which operating against the bevel wall N of the hole M will cause the tightening member C to slide to one side, which will draw one of the beveled walls of the groove V against the bridge a, thus holding the head in the desired position.

The circular plate Cr is provided with a number of equal distance graduations Y, disposed as shown in the form of a semicircle, these representing the incline of the blade A in inches to the foot from the base plate, and also with graduations Z also in the form of a semi-circle representing degrees.

The head C is provided with an index mark A which may be brought into register with somewhat similar markers B Yupron'ithe circular plateA or with any of the graduationsupon said circular plate. The v index mark Al upon the head is in alinementV with one edge of the blade A, as will be understood from Figs. 1 Vand 6.

C is a projecting blade having an arm i D adapted to slide in the groove V formed inthe head blade U., By sliding this blade C in. or out the end ofthe head blade U then calipers will be formed to be used upon small objects, butwhere calipers are needed lfor vlarger objects the inner edge of the 'l blade vC may vbe used with the adjacent edge of the blade A, and byjsliding the head blade U to one side, anydistance within the limit of the head blade may be measured between the blades A and C.

The'operation of the device is as follows: It being understood that the head C Vbeing of greater thickness than the blade A, the

" edge of said head C with the blade forms a ,T-square. .W hen the device is to be used asean ordinary squarejthe head bladevv U may be moved so that one end extends further than the other one beyond the edge of the blade A, and y bringing an index mark in'alinement with the index mark A, the head blade U will be at right angles to the blade A. Y

'If the operator desires to determine the extent of aslant relatively to a vertical line, he vplacesfeither edge of the head bladey U )against the' line, and Vloosening the nut T swings the blade A `to the proper inclination.rr He thennotes'the numerals upon the circular plate G, which indicates the number of'inches of slant to the foot vertically. For instance the numeral 4 would mean that the line measured by the blade A inone foot, a dis- I blade C', which indicates the length of the other side of the triangle, then the graduation of the scale B upon the blade A which registers with the given graduation on the inner edge of the blade C will givev the exact length of the hypothenuse of that triangle. In this manner the instrument is invaluable for workmen in constructing polygon buildings or objects.

To mark stair horses the operator will set the blades as shown in Figs. 6 and 7, then by resting the blade A against the edge of the plank c so that the head blade U and blade C rest upon the face of said plank the correct lines may be had by marking by pencil along the outer edges of said head blade U and blade A.

It is needless to mention the many uses to .which my device is applicable,`as these uses will readily suggest themselves to persons skilled in this art.

Of course I do not wish to be limited to the exact details'ot construction here shown as these may be variedwithin the limits of the appended claim' without departing from the spirit of my invention.

Having thus fully described my invention what I claim as new and useful, is-

A measuring instrument comprising a blade having a head provided with annular grooves, an angular projection Jormed integral with said head, said projection having an aperture formed therein, a spirit level mounted on said projection within said aperture, a circular plate having a iange adapted to rest within. one of the annular grooves in the head and provided with a rectangular aperture for4 .observation purposes, a screw having a head formed therewith said screw passing through the circular plate, a portion of its head resting within the other annular groove, a circular nut threaded on said screw for fixing the circular plate with respect to the blade, a bridge formed integral with the under side of the circular plate, a tightening member dove-tailed in said bridge, said tightening member having a beveled edge and provided with an opening, its side walls being beveled, a screw passing through the circular plate having a beveled end adapted to engage the opening in the tightening member, a head blade provided with a groove having beveled side walls, said head blade slidably mounted upon the bridge, a projecting blade, and an arm formed with said blade adapted to engage the groove in the head blade.

In testimony whereof, I have hereunto ailixed my signature in the' presence of two subscribing witnesses:

BENJAMIN F. SASSAMAN. litnesses:

W. H. ToMrKiNs, C. H. ANDREWS.

Copies o1 this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

